diff --git a/persistence-service-v1/persistence-service-processor-v1/src/main/java/com/iqser/red/service/persistence/management/v1/processor/migration/SaasMigrationService.java b/persistence-service-v1/persistence-service-processor-v1/src/main/java/com/iqser/red/service/persistence/management/v1/processor/migration/SaasMigrationService.java
index 302d5ecf3..368eb30de 100644
--- a/persistence-service-v1/persistence-service-processor-v1/src/main/java/com/iqser/red/service/persistence/management/v1/processor/migration/SaasMigrationService.java
+++ b/persistence-service-v1/persistence-service-processor-v1/src/main/java/com/iqser/red/service/persistence/management/v1/processor/migration/SaasMigrationService.java
@@ -47,9 +47,11 @@ public class SaasMigrationService implements TenantSyncService {
 
     private final SaasAnnotationIdMigrationService saasAnnotationIdMigrationService;
 
+    private final UncompressedFilesMigrationService uncompressedFilesMigrationService;
+
 
     @Override
-    public void syncTenant(TenantSyncEvent tenantSyncEvent) {
+    public synchronized void syncTenant(TenantSyncEvent tenantSyncEvent) {
 
         startMigrationForTenant(tenantSyncEvent.getTenantId());
     }
@@ -59,9 +61,12 @@ public class SaasMigrationService implements TenantSyncService {
     public void startMigrationForTenant(String tenantId) {
 
         // TODO migrate rules.
-
         automaticAnalysisJob.stopForTenant(tenantId);
 
+        log.info("Starting uncompressed files migration ...");
+        uncompressedFilesMigrationService.migrateUncompressedFiles(tenantId);
+        log.info("Finished uncompressed files migration ...");
+
         int numberOfFiles = 0;
         var dossiers = dossierService.getAllDossiers().stream().filter(dossier -> dossier.getHardDeletedTime() == null).toList();
         for (var dossier : dossiers) {
diff --git a/persistence-service-v1/persistence-service-processor-v1/src/main/java/com/iqser/red/service/persistence/management/v1/processor/migration/UncompressedFilesMigrationService.java b/persistence-service-v1/persistence-service-processor-v1/src/main/java/com/iqser/red/service/persistence/management/v1/processor/migration/UncompressedFilesMigrationService.java
new file mode 100644
index 000000000..faf967cbd
--- /dev/null
+++ b/persistence-service-v1/persistence-service-processor-v1/src/main/java/com/iqser/red/service/persistence/management/v1/processor/migration/UncompressedFilesMigrationService.java
@@ -0,0 +1,114 @@
+package com.iqser.red.service.persistence.management.v1.processor.migration;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.nio.file.Files;
+import java.util.ArrayList;
+import java.util.Locale;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.springframework.stereotype.Service;
+
+import com.iqser.red.storage.commons.exception.StorageException;
+import com.iqser.red.storage.commons.exception.StorageObjectDoesNotExist;
+import com.iqser.red.storage.commons.service.StorageClientCache;
+import com.iqser.red.storage.commons.service.StorageService;
+import lombok.RequiredArgsConstructor;
+import lombok.SneakyThrows;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.io.IOUtils;
+import software.amazon.awssdk.services.s3.model.DeleteObjectRequest;
+import software.amazon.awssdk.services.s3.model.GetObjectRequest;
+import software.amazon.awssdk.services.s3.model.ListObjectsV2Request;
+import software.amazon.awssdk.services.s3.model.NoSuchKeyException;
+
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class UncompressedFilesMigrationService {
+
+    private final StorageClientCache storageClientCache;
+
+    private final StorageService storageService;
+
+
+    @SneakyThrows
+    public void migrateUncompressedFiles(String tenant) {
+
+        var client = storageClientCache.getClient(tenant);
+        if (client.getS3StorageClient() != null) {
+
+            var keysToMigrate = new ArrayList<String>();
+            ListObjectsV2Request listObjects = ListObjectsV2Request
+                    .builder()
+                    .bucket(client.getS3StorageClient().getS3StorageConnection().getBucketName())
+                    .maxKeys(100)
+                    .build();
+
+            var response = client.getS3StorageClient().listObjectsV2Paginator(listObjects);
+
+            var counter = new AtomicInteger();
+            for (var listResponse : response) {
+
+                var objects = listResponse.contents();
+                for (var object : objects) {
+
+                    counter.incrementAndGet();
+                    if (!object.key().toLowerCase(Locale.ROOT).endsWith(".gz")) {
+                        log.info("Found key to migrate/compress: {}", object.key());
+                        keysToMigrate.add(object.key());
+                    }
+                }
+            }
+
+            log.info("Total files that require compression: {}  / {} ", keysToMigrate.size(), counter.get());
+
+            String tmpdir = Files.createTempDirectory("compressed-migration").toFile().getAbsolutePath();
+
+            for (var key : keysToMigrate) {
+
+                log.info("Migrating key: {}", key);
+                var getObjectRequest = GetObjectRequest
+                        .builder()
+                        .bucket(client.getS3StorageClient().getS3StorageConnection().getBucketName())
+                        .key(key)
+                        .build();
+
+                var tempFile = new File(tmpdir, key);
+                // in case it was created by a previous migration
+                tempFile.mkdirs();
+                tempFile.delete();
+
+                client.getS3StorageClient().getObject(getObjectRequest, tempFile.toPath());
+
+                var fis = new FileInputStream(tempFile);
+                storageService.storeObject(tenant, key, fis);
+
+                IOUtils.closeQuietly(fis);
+                try {
+                    tempFile.delete();
+                } catch (Exception e) {
+                    log.debug("Failed to delete temp file: {}", tempFile.getAbsolutePath());
+                }
+
+                var deleteObjectsRequest = DeleteObjectRequest.builder()
+                        .bucket(client.getS3StorageClient().getS3StorageConnection().getBucketName())
+                        .key(key)
+                        .build();
+
+                try {
+                    client.getS3StorageClient().deleteObject(deleteObjectsRequest);
+                } catch (NoSuchKeyException e) {
+                    throw new StorageObjectDoesNotExist(e);
+                }
+
+                log.info("Key: {} migrated successfully", key);
+            }
+
+        } else {
+            throw new StorageException("No client available for tenant: " + tenant);
+        }
+    }
+
+}